[TenTec] Corsair II Keyer in op. Need advice.

[Paul]

Greeting.  Isn't the band openings fun?

My Corsair II Iambic Keyer has stopped working.  I have traced it down 
to the Logic Board.

Everything else on the logic Board is working fine.  All of the display 
functions are just as they should be.  It is just that I can not key 
with the paddles, and the Memory Key don't work.

So I need advice. Should I call Ten Tec and try to buy the MC68705P3, or 
is there any other fix for this problem?

Thanks

Paul K.
WA0BAG